US8858654B2 - Activated carbon for electric double layer capacitor electrode and method for producing the activated carbon - Google Patents

Activated carbon for electric double layer capacitor electrode and method for producing the activated carbon Download PDF

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US8858654B2
US8858654B2 US13/638,017 US201113638017A US8858654B2 US 8858654 B2 US8858654 B2 US 8858654B2 US 201113638017 A US201113638017 A US 201113638017A US 8858654 B2 US8858654 B2 US 8858654B2
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carbon material
activated carbon
particle size
mixture
carbon
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US20130027845A1 (en
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Masaki Fujii
Keizo Ikai
Noriyuki Kiuchi
Kunihiko SATOU
Shinya Taguchi
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Power Carbon Technology Co Ltd
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JX Nippon Oil and Energy Corp
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    • C01B31/12—
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/30—Active carbon
    • C01B32/312—Preparation
    • C01B32/342—Preparation characterised by non-gaseous activating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H01G11/30—Electrodes characterised by their material
    • H01G11/32—Carbon-based
    • H01G11/34—Carbon-based characterised by carbonisation or activation of carbon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H01G11/24—Electrodes characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H01G11/30—Electrodes characterised by their material
    • H01G11/32—Carbon-based
    • H01G11/44—Raw materials therefor, e.g. resins or coal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13—Energy storage using capacitors

Definitions

  • the present invention relates to an activated carbon for an electric double layer capacitor electrode and a method for producing such an activated carbon.
  • An activated carbon is made from carbon materials such as carbonized coconut shell, petroleum coke or coal coke that is activated to have a porous structure.
  • the activated carbon which is porous and thus has a large surface area, has been widely used as an absorbent, a catalyst support, and an electrode material for double layer capacitors and lithium secondary batteries.
  • an activated carbon having fine pores effectively formed thereon a high crystallinity and a large surface area has been demanded to be used as an electrode material for the capacitor.
  • the activator is generally used in an amount of 2 to 4 parts by weight of the carbon material to be mixed therewith.
  • the activated carbon is produced necessarily at a large “activator/carbon material” ratio.
  • the carbon material In mixing of a carbon material and an alkali activator, the carbon material is water-repellant and thus poor in wettability with the alkali activator, which is water-soluble. Simple mixing of these two materials makes the contact therebetween insufficient. A large part of the activator is thus not used for activation reaction, and the resulting activated product (activated carbon) is small in specific surface area.
  • Patent Literature 2 As a means for bringing these materials into strong contact, methods have been known, wherein the materials are mechanically mixed with a ball mill or a Henschel mixer and wherein the alkali activator is melted and then mixed with the carbon material (Patent Literature 2).
  • Patent Literature 2 any of these methods requires the use of an activator in an amount greater than the theoretical amount so as to proceed with the activation reaction efficiently and causes an increase in the production cost.
  • Patent Literature 1 Japanese Patent Laid-Open Publication No. 2006-059923
  • Patent Literature 2 Japanese Patent Laid-Open Publication No. 2002-134369
  • the present invention was accomplished on the basis of the finding of a method that can proceed with a reaction of a carbon material and an alkali activator in an extremely efficient manner and as the result, enables the amount of the alkali activator to be less than ever before.
  • [1] a method for producing an activated carbon for an electric double layer capacitor electrode comprising adjusting a carbon material (including a calcined product of a carbon material) in particle size, followed by mixing the carbon material with an alkali activator, and then activating the mixture, wherein the mixing is carried out so that the particle size distribution composed of particles with a size of 300 ⁇ m or greater in the mixture of the carbon material and alkali activator is 5 percent or less;
  • the present invention can proceed with a reaction of a carbon material and an alkali activator in an extremely efficient manner and as the result, enables the amount of the alkali activator to be less than ever before, resulting in a significant production cost reduction. Furthermore, the present invention can provide an activated carbon that is excellent in uniformity, and the use of the activated carbon for an electrode of an electric double layer capacitor can provide a capacitor having a large capacitance per unit volume.
  • FIG. 1 a view showing the structure of a laminated cell used for evaluating a carbon electrode.
  • FIG. 2 a view showing a method for measuring initial characteristics (capacitance, internal resistance) of a capacitor.
  • a carbon material and/or a calcined product thereof is used as a starting material.
  • the carbon material is preferably a graphitizable carbon material.
  • the graphitizable carbon material include petroleum coke and coal coke.
  • the graphitizable carbon material may also be mesophase pitch and infusibilized and carbonized mesophase pitch fiber produced by spinning mesophase pitch. Petroleum coke is preferably used.
  • the petroleum coke is a product containing mainly solid carbon produced by thermal cracking (coking) a heavy fraction of petroleum at a high temperature on the order of 500° C. and is referred to as petroleum coke to be differentiated from ordinary coal-based coke.
  • petroleum coke produced by delayed coking and petroleum coke produced by fluid coking.
  • the former constitutes the majority.
  • petroleum green coke (green coke) remaining as it is taken out from a coker is preferably used.
  • the green coke produced by delayed coking contains 6 to 13 percent by mass of a volatile component while the green coke produced by fluid coking contains 4 to 7 percent by mass of a volatile component.
  • the green coke produced by either one of the methods may be used.
  • the green coke produced by delayed coking is particularly suitable in view of easy availability and stable quality.
  • the heavy fraction of petroleum No particular limitation is imposed on the heavy fraction of petroleum.
  • the heavy fraction include heavy oil that is a residue produced when petroleums are vacuum-distilled, heavy oil produced by fluid catalytic cracking petroleums, heavy oil produced by hydrodesulfurizing petroleums, and mixtures thereof.
  • the above-described carbon material is adjusted in particle size and then mixed with an alkali activator for an activation reaction, or (2) the carbon material is calcined, followed by adjustment in particle size and then mixed with an alkali activator for an activation reaction.
  • calcining a carbon material it is calcined at a temperature of preferably 500 to 700° C., more preferably 500 to 650° C. in an inert gas.
  • a temperature rise rate during calcination is imposed on the temperature rise rate during calcination.
  • a too slow rate would take time for the treatment while a too rapid temperature rise would cause volatile components to volatile explosively, possibly resulting in breakage of crystalline structures
  • the calcination is thus carried out at a rate 30 to 600° C./hour, preferably 60 to 300° C./hour.
  • the temperature is preferably kept for a certain period of time.
  • the period is usually on the order of 10 minutes to 2 hours.
  • the carbon material (including calcined products) is necessarily adjusted in particle size before being mixed with an alkali metal compound.
  • Adjustment in particle size is carried out so that the average particle diameter of the carbon material is from 1 to 15 ⁇ m, preferably from 1 to 10 ⁇ m, more preferably from 1 to 8 ⁇ m.
  • a particle diameter of smaller than 1 ⁇ m is not preferable because it would incur an increase in particle diameter caused by fusion among the particles.
  • a particle diameter of larger than 15 ⁇ m is not also preferable because it would be larger than the intended particle size.
  • a method for adjusting the particle diameter of the carbon material is generally used, wherein the carbon material is pulverized with a pulverizing means such as a jet mill.
  • the carbon material having been adjusted in particle size is treated in a mixing step where it is mixed with an alkali activator and an activation step where an activation reaction is carried out.
  • the mixing state of the carbon material and alkali activator can be improved with a method for making the distribution value composed of particles with a size of 300 ⁇ m or greater in the particle size distribution 5 percent or less thereby reducing the ratio of the alkali activator to the carbon material.
  • a method which has been used for a conventional mixing operation may be used, where the resulting mixture having been pulverized with a ball mill or a Henschel mixer is classified with a sieve to remove the particles with a diameter of 300 ⁇ m or greater.
  • No particular limitation is imposed on the conditions for pulverization, which is, however, carried out at room temperature for 10 minutes to 2 hours. If necessary, the classified product with a particle size of 300 ⁇ m or greater that generate during pulverization may be put in used for mixing again so as to produce the intended mixture.
  • a method is also preferably used, wherein a pulverizing mixer having both a pulverizing-mixing function and a classifying function is used.
  • This mixer is a normal pulverizing mixer which is further equipped with a classifying device classifying mixtures and returning particles with a size larger than the predetermined particle size to the pulverizing mixer and enables the mixture to be adjusted in particle size by controlling the revolution numbers of the crushing rotors used for pulverizing and mixing and the classifying rotors used for classification.
  • Pulverization with the pulverizing mixer having both a pulverizing-mixing function and a classifying function is more efficient than the conventional pulverizing and mixing with a ball mill or a Henschel mixer and usually carried out at room temperature for 10 seconds to 5 minutes.
  • the inventors of the present invention has found that whether the mixing state of the carbon material and the alkali activator is good or bad has a correlation with the ratio of the particles with a 300 ⁇ m or greater diameter in the particle size distribution. That is, they have found that an excellent mixing state is obtained when the distribution value of particles with a particle size of 300 ⁇ m or greater in the particle size distribution is 5 percent or less.
  • the present invention is characterized in that the intended activated carbon can be produced by mixing the carbon material and alkali activator so that the mixture has a 300 ⁇ m or greater particle size distribution of 5 percent or less even though the amount of the alkali metal is reduced than the usual. That is, the mix ratio of the carbon material and alkali activator is preferably from 1:1 to 1:4, more preferably from 1:1 to 1:3, more preferably from 1:1.2 to 1:2.5 in terms of the mass ratio of the both (carbon material:activator).
  • Examples of the activator to be used for activation reaction include KOH, NaOH, RbOH, and CsOH.
  • KOH is preferably in view of activation effect.
  • the reaction may be carried out under the similar conditions to those for the conventional activation treatment to be carried out for the production of a conventional activated carbon.
  • activation may be carried out by mixing an alkali activator and a carbon material and then heating the mixture under elevated temperature conditions of preferably 400° C. or higher, more preferably 600° C. or higher, more preferably 700° C. or higher.
  • elevated temperature conditions preferably 400° C. or higher, more preferably 600° C. or higher, more preferably 700° C. or higher.
  • No particular limitation is imposed on the upper limit temperature if the activation reaction proceeds without any problem, which is, however, preferably 900° C. or lower.
  • a method for washing the activated product is preferably a method wherein the activated product is washed with a washing liquid and solid-liquid separation is carried out.
  • a method may be employed, wherein the activated product is immersed in a washing liquid and if necessary stirred and heated so as to be mixed therewith, and the washing liquid is removed.
  • the washing liquid is preferably water or an acid aqueous solution.
  • any combination such as washing with water, washing with an acid aqueous solution, and washing with water may be used.
  • the acid aqueous solution examples include halogenated hydracids such as hydrochloric acid, hydriodic acid, and hydrobromic acid, and inorganic acids such as sulfuric acid and carbonic acid.
  • the concentration of the acid aqueous solution may be from 0.01 to 3 N. Washing with these washing liquids may be repeated more than once if necessary.
  • the activated product is preferably washed so that the pH of the detergent drain is from 7 to 8 and washed so that the alkali metal is removed as much as possible. After washing, the activated product undergoes a drying step that is conventionally carried out, thereby producing the intended activated carbon.
  • the activated carbon produced by the present invention has usually an average particle diameter of 1 to 12 ⁇ m and a specific surface area of 1500 to 3000 M 2 /g. Further, the pore volume of the pores with a diameter of 0.1 to 50 nm in the activated carbon, determined by a nitrogen gas adsorption method is from 0.5 to 3 ml/g while the pore volume of the pores with a diameter of 0.05 to 300 ⁇ m in the activated carbon, determined by mercury intrusion technique is from 0.4 to 5 ml/g. The remaining alkali metal content is 200 ppm by mass or less.
  • the use of the activated carbon of the present invention having the above-described characteristics for an electric double layer capacitor electrode can provide an electric double layer capacitor having a large capacitance per unit volume.
  • the electric double layer capacitance of the present invention is characterized in that it is provided with electrodes containing an activated carbon prepared as described above.
  • the electrodes are configured with the activated carbon and a binder and preferably in addition an electric conductive agent and may be electrodes that are integrated with a collector.
  • the binder used herein may be any conventional one.
  • the binder include polyolefins such as polyethylene and polypropylene, fluorinated polymers such as polytetrafluoroethylene, polyvinylidene fluoride and fluoroolefin/vinylether cross-linked copolymers, celluloses such as carboxylmethyl cellulose, vinyl polymers such as polyvinylpyrrolidone and polyvinyl alcohol, and polyacrylic acids.
  • the content of the binder in the electrode The content is usually selected within the range of 0.1 to 30 percent by mass on the basis of the total amount of the activated carbon and the binder.
  • the electric conductive agent may be a powdery material such as carbon black, powder graphite, titanium oxide and ruthenium oxide.
  • the blend amount of the electric conductive material in the electrode is suitably selected depending on the purposes of blending.
  • the blend amount is usually selected within the range of usually 1 to 50 percent by mass, preferably from 2 to 30 percent by mass on the basis of the total amount of the activated carbon, binder and electric conductive agent.
  • the activated carbon, binder and electric conductive agent may be mixed by a conventional method.
  • a method may be employed, wherein a solvent that dissolves the binder is added to these components to prepare slurry, which is then applied evenly on a collector or wherein these components are kneaded without adding such a solvent and pressed at ordinary temperature or while being heated.
  • the collector may be any of those of conventional materials with conventional shapes.
  • Examples of the material include metals such as aluminum, titanium, tantalum, and nickel and alloys such as stainless.
  • the unit cell of the electric double layer capacitor of the present invention is formed by placing a pair of the above-described electrodes used as an anode and a cathode to face each other via a separator (polypropylene fiber nonwoven fabric, glass fiber fabric or synthetic cellulose paper) and then immersing the electrodes into an electrolytic solution.
  • a separator polypropylene fiber nonwoven fabric, glass fiber fabric or synthetic cellulose paper
  • the electrolytic solution may be any of aqueous or organic electrolytic solutions known in the art.
  • organic electrolytic solutions are preferably used.
  • examples of such organic electrolytic solutions include those used for electrochemical electrolytic solutions such as propylene carbonate, ethylene carbonate, butylene carbonate, ⁇ -butyrolactone, sulfolane, sulfolane derivatives, 3-methylsulfolane, 1,2-dimethoxyethane, acetonitrile, glutaronitrile, valeronitrile, dimethylformamide, dimethylsulfoxide, tetrahydrofuran, dimethoxyethane, methyl formate, dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate.
  • electrolytic solutions may be used in combination.
  • the supporting electrolyte may be any of various salts, acids, and alkalis that are generally used in the electrochemical field or the battery field.
  • Examples of such a supporting electrolyte include inorganic ionic salts such as alkali metal salts and alkaline earth metal salts, quaternary ammonium salts, cyclic quaternary ammonium salts, and quaternary phosphonium salts.
  • Preferable examples include (C 2 H 5 ) 4 NBF 4 , (C 2 H 5 ) 3 (CH 3 )NBF 4 , (C 2 H 5 ) 4 PBF 4 , (C 2 H 5 ) 3 (CH 3 )PBF 4 .
  • concentrations of such salts in electrolytic solutions are properly selected from the range of usually 0.1 to 5 mol/l, preferably 0.5 to 3 mol/l.
  • example of the configuration include a coin type accommodating a pair of electrodes (positive and negative electrodes) in the form of sheet or disc with a thickness of 10 to 500 ⁇ m and a separator sandwiched between the electrodes, in a metal case, a wound type comprising a pair or electrodes and a separator disposed therebetween, all of which are wound, and a layered type comprising electrodes stacked via separators.
  • Specific surface area and pore volume were calculated from the adsorption isotherm obtained by nitrogen gas adsorption using an automatic specific surface measuring apparatus (BELSORP-mini II type, manufactured by BELL JAPAN, INC.), by the BET method.
  • BELSORP-mini II type manufactured by BELL JAPAN, INC.
  • Particle size distribution was measured using a laser diffraction type particle size distribution measuring apparatus (LA-950, manufactured by HORIBA, Ltd.).
  • LA-950 laser diffraction type particle size distribution measuring apparatus
  • the particle size distribution thereof was measured after being mixed with a small amount of a surface acting agent using water as a dispersing medium and then irradiated with an ultrasonic wave.
  • the particle size distribution thereof was measured using cyclohexane as a dispersing medium. Particle diameters accounting for 10 percent (D10), 50 percent (D50, average particle diameter) and 90 percent (D90) in the particle size distribution and a distribution value of 300 ⁇ m or larger particles were determined from the resulting particle size integral curve on the basis of the volume.
  • Petroleum green coke having an average particle diameter of 2 mm or smaller was crushed with a jet mill to be adjusted in particle size to an average particle diameter of 8 ⁇ m.
  • Potassium oxide (KOH) was added in an amount of 140 parts by mass to 100 parts by mass of the pulverized product and then mixed in a pulverizing mixer with a classifying function (ACM mixer manufactured by HOSOKAWA MICRON CORPORATION).
  • the revolution number of the pulverizing rotors was 4500 rpm while the revolution number of the classifying rotors was 2400 rpm.
  • the resulting mixture had a D50 of 16 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 0 percent.
  • the mixture was activated at a temperature of 750° C.
  • the resulting activated product (a carbon material for an electrode) was 1788 m 2 /g in a specific surface area determined by nitrogen gas adsorption method (BET method) and 0.839 cm 3 /g in pore volume.
  • the resulting electrode carbon material was mixed with carbon black and polytetrafluoroethylene powder and then pressed thereby producing a carbon electrode sheet with a thickness of around 150 to 200 ⁇ m. Electrodes with a predetermined size were cut out from the sheet to produce a laminate cell shown in FIG. 1 . The cell was used to evaluate the carbon electrode material for a capacitor.
  • the electrolyte was a propylene carbonate (PC) solution of 1.5 M of tirethylmethylammonium tetrafluoro borate (TEMA.BF 4 ).
  • FIG. 2 shows the method of the measurement.
  • Capacitance was determined by measuring the total energy amount stored in the capacitor for calculation (energy conversion method).
  • Vc Actual voltage obtained by subtracting a voltage drop due to internal resistance from full charged voltage
  • I is a discharge current (A).
  • the rate characteristics of the capacitor were determined by measuring the capacitance after the constant current discharge was changed from 0.36 mA/cm 2 to 72 mA/cm 2 .
  • the results of the rate characteristics were summarized as the maintenance rate of capacitance upon change of the constant current discharge on the basis of the capacitance at a discharge of 0.36 mA/cm 2 .
  • the results are set forth in Table 2.
  • a mixture was produced under the same conditions for Example 1 except that the ratio of potassium hydroxide to 100 parts by mass of the pulverized product was changed to 220 parts by mass (the mixture had a D50 of 19 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 0 percent).
  • the resulting mixture was activated to produce an activated carbon for an electrode with the same procedures of Example 1.
  • the resulting activated product (a carbon material for an electrode) was 2324 m 2 /g in a specific surface area determined by nitrogen gas adsorption method (BET method) and 1.087 cm 3 /g in pore volume.
  • the same petroleum green coke as used in Example 1 was pulverized with a jet mill so as to have an average particle diameter of 13 ⁇ m.
  • the pulverized product in an amount of 100 parts by mass was mixed with 220 parts by mass of KOH with a mixer wherein the revolution number of the pulverizing rotors was 4500 rpm and the revolution number of the classifying rotors was 2000 rpm (the mixture had a D50 of 21 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 0 percent).
  • the resulting mixture was activated, and the resulting activated product (a carbon material for an electrode) was 2091 m 2 /g in a specific surface area determined by nitrogen gas adsorption method (BET method) and 1.029 cm 3 /g in pore volume.
  • BET method nitrogen gas adsorption method
  • Example 2 The same petroleum green coke as used in Example 1 was calcined at a temperature of 550° C. for one hour in a nitrogen gas atmosphere. The temperature rise rate during calcination was 200° C./hour.
  • the calcined product was pulverized with a jet mill to have an average particle diameter of 6 ⁇ m.
  • the pulverized product was mixed with potassium hydroxide in the same manner as Example 2 except that the revolution number of the pulverizing rotors was 3500 rpm and then activated at a temperature of 700° C. for one hour, washed, and dried thereby producing an activated carbon.
  • the mixture had a D50 of 51 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 5 percent.
  • the mixture had a specific surface area of 2142 m 2 /g and a pore volume of 1.027 cm 3 /g.
  • An activated carbon for an electrode was produced with the same procedures of Example 4 except that potassium hydroxide in an amount of 220 parts by mass is mixed with 100 parts by mass of the pulverized product which was the same as that produced in Example 4 in a ball mill, and the mixture was classified to 300 ⁇ m or smaller particles.
  • the resulting mixture had a D50 of 69 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 0 percent, and the activated carbon was 2273 m 2 /g in a specific surface area determined by nitrogen gas adsorption method (BET method) and 1.050 cm 3 /g in pore volume.
  • Example 1 The procedures of Example 1 was followed except that the carbon material adjusted in particle size and KOC was mixed without using a pulverizing mixer and pulverized at room temperature for one hour with a usual ball mill.
  • the mixture had a D50 of 625 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 30.3 percent.
  • the mixture was activated, washed and dried in the same manner as Example 1 but was not sieved.
  • the resulting activated carbon had a specific surface area of 1465 m 2 /g and a pore volume of 0.655 cm 3 /g.
  • Example 1 A mixture was produced under the same conditions of Example 1 except that the ratio of the pulverized product (average particle diameter of 8 ⁇ m) produced by pulverizing the same petroleum green coke as used in Example 1 was changed from 100 parts by mass to 80 parts by mass (the mixture had a D50 of 15 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 0 percent).
  • the mixture was activated, washed and dried in the same manner as Example 1 thereby producing an activated carbon.
  • the activated carbon had a specific surface area of 1359 m 2 /g and a pore volume of 0.621 cm 3 /g.
  • a mixture was produced with the same procedures of Example 2 except that the revolution number of the pulverizing rotors was changed to 3000 rpm (the mixture had a D50 of 52 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 36.3 percent).
  • the mixture was activated, washed, and dried in the same manner as Example 2.
  • the resulting activated product (a carbon material for an electrode) was 1632 m 2 /g in a specific surface area determined by nitrogen gas adsorption method (BET method) and 0.780 cm 3 /g in pore volume.
  • a mixture was produced with the same procedures of Example 2 except that the revolution numbers of the pulverizing rotors and classifying rotors were each changed to 3000 rpm (the mixture had a D50 of 53 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 17.8 percent).
  • An activated carbon for an electrode was produced from this mixture.
  • the resulting activated carbon (a carbon material for an electrode) was 1692 m 2 /g in a specific surface area determined by nitrogen gas adsorption method (BET method) and 0.981 cm 3 /g in pore volume.
  • a mixture was produced with the same procedures of Example 4 except that the revolution numbers of the pulverizing rotors and classifying rotors were changed to 4500 rpm and 1500 rpm, respectively (the mixture had a D50 of 80 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 25.2 percent).
  • An activated carbon for an electrode was produced from this mixture.
  • the resulting activated carbon (a carbon material for an electrode) was 1727 m 2 /g in a specific surface area determined by nitrogen gas adsorption method (BET method) and 0.824 cm 3 /g in pore volume.
  • a mixture of the same pulverized product as used in Example 5 and KOH with a ball mill had a D50 of 1314 ⁇ m and a 300 ⁇ m or greater particle size distribution value of 59.1 percent.
  • the mixture was activated, washed and dried in the same manner as Example 5 thereby producing an activated carbon.
  • the activated carbon had a specific surface area of 1651 m 2 /g and a pore volume of 0.760 cm 3 /g.
  • Example 1 Example 2
  • Example 3 Example 4
  • Example 5 Example 1 Calcination Calcination Conditions Not Carried Not Carried Not Carried 550° C. 550° C. Not Carried Out Out Out 1 hr 1 hr Out Particle Size Average Particle Diameter 8 8 13 6 6 8 Adjustment ( ⁇ m) Mixing Pulverizing Rotor 4500 4500 3500 Ball Mill Ball Mill Revolution Number (rpm) Mixing Mixing Classifying Rotor 2400 2400 2000 2400 300 ⁇ m Without Revolution Number (rpm) or smaller Sieving Mix Ratio Activator/Carbon (g/g) 1.4 2.2 2.2 2.2 2.2 1.4
  • Mixture Particle Size D10 7 8 8 9 11 10 Distribution D50 16 19 21 51 69 625 (um)
  • the present invention has a significantly large industrial value because it can proceed with a reaction of a carbon material and an alkali activator in a less amount than ever before in an extremely efficient manner and thus can provide an activated carbon that is excellent in uniformity and has a large capacitance per unit volume.

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WO2015119269A1 (ja) * 2014-02-10 2015-08-13 コスモ石油株式会社 活性炭の製造方法及び活性炭
JP6709902B2 (ja) * 2014-07-10 2020-06-17 パナソニックＩｐマネジメント株式会社 キャパシタ
TW201708106A (zh) * 2015-08-17 2017-03-01 康寧公司 低起泡碳活化方法及其能量儲存裝置
SG11201806820UA (en) * 2016-03-09 2018-09-27 Applied Materials Inc Correction of fabricated shapes in additive manufacturing
CN107285312B (zh) * 2016-04-06 2019-12-20 中国科学院理化技术研究所 一种片状活性炭材料及其制备方法和应用
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